I guess the question is whether it's making a noise because there's a fault with another component, or the valve mechanism. Does it still operate in all three positions correctly: water, heating, and mid (both)?Hi,
Subject valve has just started making a humming noise.
Anyway to test its ok or to make it stop making a noise at night?
Looked here & there is some mentions of just the motor being replaced, easy job?
ta
Lee
Reply to the thread, titled "V4073A1039 HW Valve humming" which is posted in Central Heating Systems on Electricians Forums.